nakamichi vs threshold

Buy the Nakamichi and you will never look back with disappointment.

FWIW the Nakamichi amplifiers had/have a reputation for being unstable that they had from the very beginning. Its one thing for an amplifier to sound nice, another for it to run reliably from day to day.

Sorry to disagree, but Nakamichi amplifiers have not had a "reputation for being unstable." Do some research on the internet and I doubt that you will hear many negative comments from current or past Nakamichi owners. Nakamichi amps still sell for a high percentage of their original cost relative to their vintage. I just don't want the OP to take the above comment as the last word on Nak amps. They are a Nelson Pass design and still well-respected today.

Thanks for the answers.
Tonykay, what do you think about the differences between PA5 and PA7?
I am asking myself : Maybe PA7 is a bit over dimensionned for me, too much heat, too much weight... ?
Will the additional power improve the sound on JBL L112 ? (89db efficiency)
My listening room leasures 25 square meters.